As a deity name
Name 779 of the Rama Sahasranāma — Padma Purana / Skanda Purana, as taught by Lord Shiva to Goddess Parvati
As a Hindi name
शांति · feminine
peace, tranquility, quiet, ease
a Hindi word, a tatsama: the Sanskrit word borrowed unchanged into Hindi शान्ति — per Wiktionary’s etymology record
“Learned borrowing from Sanskrit शान्ति (śānti).” — per Wiktionary’s etymology record
śānti f. tranquillity, peace, quiet, peace or calmness of mind, absence of passion, averting of pain (śānti! śānti! śānti! may the three kinds of pain be averted!), indifference to objects of pleasure or pain, KaṭhUp.; MBh. &c.
alleviation (of evil or pain), cessation, abatement, extinction (of fire &c.), AV. &c. &c.
As a Sanskrit word
Meaning
peace, tranquility, quiet, ease (a Hindi word, a tatsama: the Sanskrit word borrowed unchanged into Hindi शान्ति; per Wiktionary’s etymology record)
Scripturally attestedWhy this matches what you typed
No corroborated Sanskrit reading of this spelling is established. It resolves as a Hindi word — see “As a Hindi name” above. We say this plainly rather than force a Sanskrit story onto it.
Caveats
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